VapoChill Puts a Pentium 4 with 800 MHz FSB within Reach

K.O. In The Final Round: Stability Stops After 750 MHz FSB

While our benchmarks should be familiar to you, the results require a little explanation. For starters, we weren't able to reach our goal of stable 800 MHz FSB. The system stopped being more or less stable after 750 MHz. With patience and some crashes in between, we also achieved the performance level at 800 MHz FSB.

This time, though, we didn't swap the processor, preferring to stick with the same model and its set multiplier (2.26 GHz with a x17 multiplier). That means that each uptick in FSB clock pumped up the processor clock and the RAM clock. The only clock speed we left was for PCI and AGP - at 33 and 66 MHz, respectively; the BIOS on the Asus P4G8X permits these settings. Since all clock speeds increased proportionately, we obtained wonderfully scalable results.

The following table explains the results in the benchmark diagrams:

CPU FSB Clock Eff. CPU Clock Memory Clock AGP Clock
P4 2.26 533 MHz 2.26 GHz 266 MHz 66 MHz
P4 2.26 600 MHz 2.55 GHz 300 MHz 66 MHz
P4 2.26 666 MHz 2.83 GHz 333 MHz 66 MHz
P4 2.26 700 MHZ 2.98 GHz 350 MHz 66 MHz
P4 2.26 750 MHz 3.20 GHz 376 MHz 66 MHz
P4 2.26 800 MHz 3.40 GHz 400 MHz 66 MHz
P4 3.06 533 MHz 3.06 GHz 266 MHz 66 MHz
P4 3.06 592 MHz 3.40 GHz 298 MHz 66 MHz

We included a Pentium 4 3.06 as a control - to ensure comparability, we took one without HyperThreading. We also used this CPU to reach the 3.4 GHz touted by Intel the old-fashioned way: by overclocking the FSB from 133 to 148 MHz.

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